'Clear known indicators' button removes all known indicators

Submitted by Murray

Assigned to Andrzej

Link to original bug (#11419)

Description

Created attachment 5843 Screenshot of the Indicators Properties window after 'Clear known indicators' has been clicked and the window has been closed then re-opened

When I click the "Clear known indicators" button the the properties, all of the indicators are gone from the panel and the list on closing then re-opening the properties (see attachment). I have to remove then re-add the item to the panel to fix this, then re-configure my preferred visibility settings of each indicator.

Attachment 5843, "Screenshot of the Indicators Properties window after 'Clear known indicators' has been clicked and the window has been closed then re-opened":